Electromagnet for printing machines and the like



F. SHURLEY March 26, 1935.. v

ELEGTNONAGNET Foa PRINTING Mmm-NES AND THE LIKE Original Filed May 6, 1931 l IIIIIIIIIIIIIII'I'IIIIII.

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UNITED s TATE l ELEUI'EOMAGNET FOB PRINTING MACHINES AND THE LIKE Frederick Shux'ley, Los Angeles, Calif.

Application May s, 1931, serial 10,535,396 u Renewed March 10, 1934 2 Claims.

whereby metallic pressed against a sheet of paper, cloth, glass, 5 metal, etc., for the purpose of decorating, painting or cutting the same.

The invention consists of a multi-polar electro-magnet which has at least one substantially plane surface area of relatively large An object of my invention is to provide an electro-magnet of the character stated in which the plane surface is composed of a number of alternate magnetic strips or surfaces of opposite polarity. In tables of this character heretofore in.

use. cold spots were present, over which the stencil was not rmly held. This is particularly undesirable where paint, enamel, or other liquid substances are applied by spraying thru a stencil opening.- A raised portion or edge of the stencil will permit the liquid to pass and will spoil the work.

under the stencil Another object is to overcome these diiliculties by providing an electro-magnet of the character stated which has a practically uniform attractive force over the entire surface of the magnet. I

accomplish this by providing regions of opposite magnetic there is a magnetic eld betw minus regions. brought near the table. flux carried thereby and ing material attract each lines of force in my table pendicular to the surface proaching stencil, practically uniform In the accompanying description, with a stencil which t0 sive the metal or other that the description thruout the surface. It is I have presented my is sprayed or brushed'v upon desired print UDO!! P8961',

a'multiplicity of polarity so that een the plus and When magnetic material is it endeavors to the the table and approachother uniformly. The are substantially perthereof and to the apand as previously stated, are

entire surface.

drawing and detailed invention for use cloth, to be understood and details of the particular embodiment of the invention illustrated in the drawing are given only by way plainthenatureamlcharacter andarenottobeeonstruedas scopeasexpressed ventiorn may drawing, the subioined the appended claims.

In the drawing Figure l is a fragmentary, my electro-magnet.

of example to exof the invention, limiting the same in the appended features o f inaccompanying top plan view of (Cl. F15- 367) This invention relates to electro-magnets for printing machines, and the like, ,or metalized stencils are held and tightly Figure 2 is a transverse, sectional view of the same.

Figure 3 is an enlarged, fragmentary, sectional View taken on line 3-3 oi Figure 2.

Figure 4 is a fragmentary, sectional view taken 5 on line 4-4 of Fig. 2.

Figure 5 is a perspective view of a slightly modified form of magnet which forms the table.

Referring more particularly to the drawing, the numeral 1 indicates the metal base of my mag- .l0 netic table, which is here shown as substantially rectangular in form, altho any other shape may be utilized if desired. A plurality of metal cores 2 rises from the base 1 and is suitably secured therein. In the present instance, the cores are 15 secured by means of screws 3 which extend thru the base and into the end of the cores. The cores are equidistantly spaced over'the entire surface of the base, the purpose of which will be evident as the description proceeds. A spool 4 formed of 20 non-magnetic material surrounds each of the cores 2 and on each spool there is wound a coil of wire 5. By this means, an electro-magnet is formed with a magnetic core thru which the flux or lines of force are carried.

Above the electro-magnets, I position a solid plate 6 which is formed of a magnetic material. Spaced above the plate 6 and attached to the ends of each of the cores 2, there are magnetic plates 'I substantially rectangular in form in the present 30 instance, and each of these plates is magnetized uniformly thruout the entire surface of the table so as to uniformly attract a stencil, or the like, for the'purpose of printing, cutting or the like. There is an individual magnet plate 7 for each 35 core 2. The plate 6 and the magnet plates 'I are separated by a layer of non-magnetic material 8, which material also extends between the various magnet plates to segregate these last named plates substantially as shown in Figures 1 and 3. 40

Intcrsecting grooves 9 are cut in the top surface of the magnet plates 7, and these grooves are filled with a non-magnetic material 10. The cores 2 extend thru and contact with the plate 6, and are suitably secured to the magnet plates 7. Thus, 45 both of the members 6 and 'l are energized by the cores.

Electrical current from a suitable source is conducted to the wires 5 on each of the spools, and the spools may be connected in series or in paral- 50 lel, whichever is found more desirable. A strip of insulating material 11 is provided above the spools 4 and a second strip of insulating material 12 is positioned below the spools. A casing 13 surrounds the magnetic table and is secured to the plate 6 by means of screws, or

form of magnet which, may bev built up to form' a table for the same purpose as: that previously described. In the present instance, a plurality of substantially Y-shaped metal plates 14 are placed side by side and are separated by Y- shaped strips of insulating material 15. The entire pack is surrounded by a coil of wires 16 thru which an electrical current is passed. 'I'he electrical current passing thru the coil magnetizes the metal plates. the upper edge of the magnetic table and each strip is provided with a longitudinally. extending groove 18 to which a tube 19 extends. A partial vacuumfromfa pump-Knot shown) is drawn in :the tubes 19 and when a sheet of paper, cloth, leather, or thelike isplacedvover the strips 17; and over the grooves therein, it will be drawn tightly against the surface of the magnetic table so that it can be acted upon thru a metal stencil which is-placed over thepaper, or the like. jThe metal stencil is drawn tightly against the sheet of cloth or the like yby the pack of magnets.

Having described my invention, I claim:

Strips 17 aresecured adjacent.-

1. An electro-magnet comprising a metal base, a plurality of spaced cores secured in said base and rising therefrom, a spool threaded on each core, a wire coil wound on each spool, a plate of magnetic material thru which the cores extend, a plurality of magnetic plates spaced above said 'iirst namedplate, each of said cores being secured to a magnetic platea nou-magnetic material between said magnetic plates andv the first named plate, said non-magnetic material surrounding the magnetic plates and separating the same, said magnetic plates having intersecting grooves formed therein, and non-magnetic material filling said grooves whereby the plates are divided into a plurality of poles.

2. An electro-magnet comprising a metal base, a plurality. of spaced cores secured in said base andrising therefrom, a spool on each of the cores, a Wire coil wound on each of the spools, a magnetic metal plate above the spools, said cores extending thru' the metal plate, platesmounted one ontop of each of the cores, anon-magnetic material separating said magnetic plates andthe first named plate, each of saidsecond magnetic plates having apair of intersecting grooves formed therein, and non-magnetic material filling said grooves ,wherebyv each of said.

magnetic plates is dividedinto a plurality of poles.

FREDERICK SHURLEY.

a plurality of magnetic 

